/*
 * Async Treeview 0.1 - Lazy-loading extension for Treeview
 * 
 * http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
 *
 * Copyright (c) 2007 Jörn Zaefferer
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id$
 *
 */

;(function($) {

        function load(settings, root, child, container) {
	        function createNode(parent) {
		        var current = $("<li/>").attr("id", this.id || "").html("<span>" + this.text + "</span>").appendTo(parent);
		        if (this.classes) {
			        current.children("span").addClass(this.classes);
		        }
		        if (this.expanded) {
			        current.addClass("open");
		        }
		        if (this.hasChildren || this.children && this.children.length) {
			        var branch = $("<ul/>").appendTo(current);
			        if (this.hasChildren) {
				        current.addClass("hasChildren");
				        createNode.call({
					        classes: "placeholder",
					        text: "&nbsp;",
					        children:[]
				        }, branch);
			        }
			        if (this.children && this.children.length) {
				        $.each(this.children, createNode, [branch])
			        }
		        }
	        }

            console.log("before load function");
            if(settings.loadFunction)
            {
                settings.loadFunction(root, function(response) {
			        child.empty();
			        $.each(response, createNode, [child]);
                    $(child).treeview({loadFunction: settings.loadFunction});
	            });
            }
            else
	            $.ajax($.extend(true, {
		            url: settings.url,
		            dataType: "json",
		            data: {
			            root: root
		            },
		            success: function(response) {
			            child.empty();
			            $.each(response, createNode, [child]);
	                    $(container).treeview({add: child});
	                }
	            }, settings.ajax));
        }

        var proxied = $.fn.treeview;
        $.fn.treeview = function(settings) {
            console.log("in tree view")
            
	        if (!settings.url && !settings.loadFunction) {
		        return proxied.apply(this, arguments);
	        }
            console.log("async")
	        var container = this;
	        if (!container.children().size())
            {
		        load(settings, "source", this, container);
                return;
            }
	        var userToggle = settings.toggle; 
	        return proxied.call(this, $.extend({}, settings, {
		        collapsed: true,
		        toggle: function() {
                    var $this = $(this);
                    if ($this.hasClass("hasChildren")) {
				        var childList = $this.removeClass("hasChildren").find("ul");
                        load(settings, this.id, childList, container);
			        }
			        if (userToggle) {
				        userToggle.apply(this, arguments);
			        }
		        }
	        }));
        };
})(jQuery);